Beyerdynamic DT 880 (600 ohm) driving help?

Hey everyone im new to the world of audiophiles (but i am REALLY into it) and i need some help. For christmas i am getting the Audio Technica ATH M50's, FiiO E7 portable headphone amplifier, and the FiiO L9 line out cable. I also plan to buy the FiiO E9, as it my FiiO E7 will dock with it and increase the audio quality that the amp puts out. I also want a good open back headphone for home use and am considering the Beyerdynamic DT 880 600 ohm version. What I want to know is if the FiiO E7 and E9 combination will drive the Beyerdynamic DT 880's sufficently. Any help is appreciated.